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Old Back Boiler - 2 Questions.
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11-10-2010 7:37pm#1I've an old back boiler in one of my fireplaces. It's old but I don't know how old. The house is 50 years old and for all I know the back boiler could be a similar age.
It is not connected to the radiators - it simply heats the water in the DHW cylinder. Apparently the hot water cylinder is a primatic cylinder, a design that is no longer used. The back boiler works just fine and heats the water to a serious temperature if I allow it.
I have two questions:
1. Can anybody explain exactly how the primatic cylinder works? I understand the concept of the air bubble keeping the primary and secondary water separate but I can't get my head around how this type of cylinder achieves the separation.
2. I've noticed a gap between the boiler itself and the fireplace. Are these gaps a potential problem? If so, why? If it needs to be repaired will fire cement do the job? Pics of the gap below.
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